A brewing module and drinks preparation machine

ABSTRACT

A brewing module for preparing a brewed drink from a portion capsule, includes a first brewing module part and a second brewing module part, which is movable relative to the housing between a first brewing module part position and a second brewing module part position, wherein a brewing chamber is formed in the second brewing module part position. Furthermore, an operating element is able to be brought manually from a first into a second operating element position, from which a movement is transmitted via a transmission mechanism into a movement of the second brewing module part. The brewing module further includes a damping device for damping the movement of the second brewing module part. This damping device is designed such that it has non-constant damping characteristics as a function of the position and/or as a function of the movement direction.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to extraction appliances for preparing drinks or the like, from an extraction material, for example ground coffee, which is contained in a capsule. In particular, it relates to a brewing module for an extraction appliance, to a capsule recognition module, as well as to a drinks preparation machine with such a brewing module and/or capsule recognition module.

Description of Related Art

Extraction appliances for preparing drinks or the like from an extraction material present in a portion package are known, for example, as coffee machines or espresso machines. In many corresponding systems, the portion packages are designed as capsules, in which the extraction material is sealed, for example in an airtight manner. For extraction, the capsule is pierced, for example at two sides, which are opposite to one another. An extraction fluid—generally hot water—is introduced at the first side. The extraction product is discharged from the capsule at the second side. This takes place in a so-called brewing module. Such a module includes a brewing chamber, in which the capsule is received. Brewing modules, with which the capsule is inserted and the brewing chamber is closed manually by way of an operating lever are particularly popular, wherein the capsule is automatically removed from the brewing chamber and ejected into a capsule container after the brewing procedure on renewed opening of the brewing chamber. Such brewing modules with an automatic capsule ejection are generally designed as horizontal brewing modules, i.e., the insertion of the capsule is effected from above, the closure of the brewing chamber is a horizontal relative movement of two brewing chamber parts, the brewing fluid flows essentially horizontally and the capsule container is formed below the brewing chamber.

The force to be applied on closing the brewing chamber and also on reopening is not constant. In the case of manually closable brewing modules, this results in the disadvantage that a compromise must be found with regard to the lever ratios and the transmission ratios. It is not possible to set/adjust the lever and transmission ratios such that, on the one hand, an easy actuation is also possible where a high force is required (for example, on piercing the capsule) and, on the other hand, a generally not too small a resistance results. Too small a mechanical resistance does not give the user any feedback and is not perceived as being haptically pleasant. Furthermore, the user perceives a sudden increase or drop of the mechanical resistance as an unpleasant jolting—and the appliance therefore acts in an inferior manner.

A damping device for damping a closing and opening movement of a brewing module is already known, for example, from EP 2 485 629. This is in the context of a spring drive given the opening moment and in particular serves for preventing too fierce an abutting on a stop taking place at the end of the opening movement. The damping device can function via inertia and friction, but also via friction alone, hydraulically, by way of air damping, magnetically, etc., and generally damps the closing and opening movement in a uniform manner.

SUMMARY OF THE INVENTION

An object of the present invention is to overcome the disadvantages of the state of the art and to provide a brewing module for preparing a brewed drink, as well as a drinks preparation machine, with regard to which the closing of the brewing chamber is effected in a manual manner and despite this a functionally and haptically satisfactory closure behaviour results, in particular without the mechanics becoming too complicated and necessitating too many individual parts.

According to the invention, a brewing module for preparing a brewed drink from a portion capsule is provided, the brewing module includes:

-   -   a housing;     -   a first brewing module part and a second brewing module part,         which is movable relative to the housing between a first brewing         module part position (opened brewing module) and a second         brewing module part position (closed brewing module), wherein a         brewing chamber is formed by the first and the second brewing         module part in the second brewing module part position, the         brewing chamber at least partly surrounding the portion capsule         being located in the brewing position with the brewing         procedure, wherein the brewing module is configured to brew a         brewed drink by way of introducing a brewing fluid into the         capsule and to discharge this out of the capsule; and     -   an operating element, which can be brought manually from a first         into a second operating element position, and     -   a transmission mechanism for transmitting a movement of the         operating element into a movement of the second brewing module         part relative to the housing.

Furthermore, the brewing module includes a damping device for damping the movement of the second brewing module part. According to the present invention, the damping device is designed such that it has a damping characteristic, which is non-constant, as a function of the position and/or movement direction.

Hereinafter, the movement of the second brewing module part from the first into the second position is also denoted as a “closure movement” and the reverse movement as the “opening movement”.

For example, the damping device can be designed such that it only damps along a part-stretch of the displacement stretch and/or only during the closure movement or only during the opening movement.

The approach according to the invention, given a non-constant mechanical resistance during the closure procedure or during the opening procedure, permits a targeted damping to be effected or effected in an increased manner, where the resistance abruptly reduces as a function of the path of the second brewing module part. The damping device can therefore prevent a jolting, which can not only have a positive effect on the perception by the user but also on the service-life of the brewing module by way of jolt-like movements being avoided.

In particular, the damping device can be formed by way of two parts of the brewing module which are moved relative to one another—for example a cam disc and the housing or the second brewing module part and the housing—each having a contact portion that only comes into physical contact with one another and rub on one another on a part-stretch of the displacement stretch. Such contact portions can be formed, for example, by a sliding surface on the one hand and an elastic damping element on the other hand.

Supplementarily or alternatively, one can envisage the one of the contact of portions being formed by a damping element that, with the closure movement and with the opening movement, is pressed against the other contact portion to a different extent—in particular not at all with the opening movement or with the closure movement.

In embodiments, the damping element can be designed, for example, as an elastic element that is movably received in a receiver of the respective part of the brewing module, wherein during the one movement (for example with the closure movement) it is pressed against the other contact portion. This, for example, can be effected by way of the receiver including a narrowing towards the direction, in which the damping element is pressed given the one movement, and in which narrowing the damping element is pressed together between the two parts, whereas during the opening movement it can yield away from the other contact portion or vice versa.

The damping element can be designed, for example, as an elastic ring (damping ring). Instead of a damping ring, another, for example, elastic damping element can also be used, for example an elastic lip or an elastically deformable cushion.

The damping element is preferably arranged and designed such that, when it comes into contact with the sliding surface, it is deformed in the one direction by a movement relative to the sliding surface and an elastic force, which counteracts the deformation, acts upon the sliding surface, whereas it can yield given a movement in the other direction and slide along the sliding surface in an essentially force-free manner. On using a damping element, which is jammed in a narrowing during the movement in one of the movement directions, such a deformation is accordingly effected by the pressing-together of the damping element. Given an elastic lip, it is achieved by way of the lip not being perpendicular to the sliding surface but at a non-right-angle thereto, i.e., it projects obliquely to the sliding surface and towards the side into which it is moved given the closure movement (when this is to be damped in a part-section) or given the opening movement.

In particular, one can envisage the housing including a sliding surface that projects towards the second brewing module part or towards another element that is moved given its movement—for example a cam disc of the transmission element, and the moved element (brewing module, cam disc, other element) including a damping element that, on account of an elastic force and/or on account of a jamming on the part-stretch and/or in at least one movement direction, is pressed against the sliding surface—or vice versa.

Such a sliding surface can have a distance to the damping element, which varies as a function of the position, so that the friction force changes as a function of the position.

In particular, a damping element can be formed from an elastomer.

The transmission mechanism for transmitting the movement of the operating element can include a cam disc, which is rotatably mounted on the housing and which is with a first guide surface, wherein the second brewing module part is displaceable by the first guide surface along a displacement stretch which is fixed with regard to the housing, from the first brewing module part position into the second brewing module part position by way of the cam disc being rotated, and wherein the first guide surface defines a transmission ratio (ratio between the path, which is covered by the second brewing module part, on the one hand, and the angular movement, which is covered by the cam disc, on the other hand), which significantly (for example, by at least a factor of 2) varies along the first guide surface.

Herein, the transmission ratio varies significantly. In embodiment examples, it differs between the largest and the smallest value by at least a factor of 2, often by at least a factor of 4, 6, 8, 10 or more.

In such embodiments, the transmission ratio in particular can be selected such that given a larger closure force it is smaller than where the closure force is small.

Apart from the first guide surface, the cam disc can also define a second guide surface, by way of which the second brewing module part is displaceable along the displacement stretch, which is fixed with regard to the housing, from the second brewing module part position into the first brewing module part position. Such a second guide surface in particular can also run such that a variable transmission ratio is defined along it, for example likewise in sections and for example likewise substantially, with a factor between the largest and the smallest transmission ratio of at least 2, or at least a factor of 4, 6, 8, 10 or more.

The first and the second guide surface can be designed as boundaries of a guide opening in a cam disc (such an opening can be a continuous hole or a deepening). A, for example, pin-like guide element, which is connected to the second brewing module part, for example by way of it being integrally formed on this or being guided by this, then engages into this guide opening.

The second guide surface can be non-parallel to the first guide surface, i.e., it is not necessary for the transmission ratios to be equally large at a certain position of the second brewing module part with the closure movement and with the opening movement.

The second brewing module part is movable relative to the housing, for example in a linear-translatory, in particular horizontal manner, i.e., the displacement stretch in particular is linear and horizontal. The first brewing module part can be assembled in a manner fixed with respect to the housing. However, one also does not rule out the first module part also being movable and, for example, executing a movement that is opposite to that of the second brewing module part.

The displacement stretch, which is fixed with respect to the housing, can be defined, for example, by a guide track, for example a guide groove, of the housing, into which track a guide element, for example a guide pin, which is connected to the second brewing module part engages. Such a guide element can also interact with the guide surface, wherein then a section of the guide element engages into the guide track and another section interacts with the guide surface. For this purpose, such a guide element can optionally be provided with two bearings that are decoupled from one another, of which a first is in engagement with the guide track and a second with the guide surface.

In particular, the second brewing module part can be an injector, by way of which the portion capsule is pierced and from which, for example, hot water as a brewing fluid is introduced into the portion capsule. The first brewing module part can form a discharge device for leading the extraction product out of the capsule. For this purpose, it include for example extraction-side piercing elements for the extraction-side piercing of the capsule or other structures, the piercing elements opening the capsule at the extraction side. The reverse is also conceivable, i.e., the first brewing module part can form the injector and the second brewing module part can form the discharge device.

In particular, the operating element can be an operating lever that can be brought from the first into the second position by way of a tilting movement from the top to the bottom. In the second position, for example the operating lever closes a capsule insert opening that is formed by a housing of the drinks preparation machine—for example of the brewing module.

The invention also relates to a drinks preparation machine with a brewing module of the discussed type.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiment examples of the invention are hereinafter described by way of figures. In the figures, the same reference numerals describe the same or analogous elements. There are shown in:

FIGS. 1 and 2 are, in each case, a view of a brewing module in the opened and in the closed state;

FIG. 3 is an exploded representation of the brewing module of FIGS. 1 and 2;

FIG. 4 is a cam disc of the brewing module of FIG. 1-3;

FIGS. 5 and 6 show, in each case, a simplified sectioned representation of the brewing module during the closure and opening procedure;

FIG. 7-9 show a detail of a sectioned representation of the brewing module, which renders the damping device easily visible, during different phases; and

FIG. 10 shows a schematic diagram of the coffee machine according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

The brewing module 1 according to FIGS. 1-3 includes a brewing module housing 2. Two brewing module parts, which are movable relative to one another, specifically a discharge device 3 and an injector 4, are guided in the brewing module housing 2. The housing here includes two housing side-parts 21.

The injector 4 includes perforation elements for piercing a portion capsule, which is at least partly filled with an extraction material—for example ground coffee. The injector 14 is configured to introduce a fluid—for example hot water—through the perforation elements or past these into the pierced capsule, wherein the water can be fed via a water feed (not shown), which can include, for example, a flexible tube.

With the embodiment example described here, the discharge device 3 also includes perforation elements, specifically extraction-side piercing tips. These can be designed, for example, as is described in WO 2015/039258 or in WO 2010/118544 or have another design, and the application of principles other than piercing tips, for example with grating-like structures are also possible.

As is known per se, for preparing a brewed drink, a capsule is placed between the discharge device 3 and the injector 4, and these are moved towards one another such that a brewing chamber encompassing the capsule is formed between these. The hot water is fed under pressure through the injector to the capsule, and the extraction product flows through the discharge device 3 via a drinks outlet 13 into a drinks vessel, which, for example, is placed therebelow.

The relative movement of the second brewing module parts (injector) relative to the first brewing module part (discharge device) in the embodiment example described here is achieved by way of the discharge device 3 being assembled in a manner in which it is fixed to the housing, whereas the injector 4 is movable along the horizontal axis.

Before the preparation of a brewed drink, the user inserts a capsule via a capsule insert opening, which is arranged on the housing at the upper side, the capsule being held at the height that is envisaged for this by way of suitable means as described, for example, in WO 2015/048914, until the brewing chamber is closed. Such an insertion of the capsule into the brewing chamber can be effected in a direct manner, or as described in WO 2016/087190, in an indirect manner by way of the capsule firstly being held at a position above the brewing chamber, for example for the purpose of a capsule recognition.

The brewing module include an operating lever 6 for the operation by the user for the purpose of closing the brewing chamber, the operating lever being fixedly fastened to a cam disc arrangement, which is composed of two cam discs 30. The cam discs for their part are each pivotably mounted relative to the housing about a pivot 31, which is arranged in each case in a bore 32 in the respective housing side-part 21 and in the respective cam disc 30. The two cam discs 30 are connected to one another via a first and a second optional stabilisation pin 45, 46, in order to give the cam disc arrangement additional stability A second housing guide track 25, in which the first guide pin 45 can be loosely or glidingly moved given a pivoting movement of the cam disc arrangement is arranged in each case in the two housing side parts, for the first guide pin 45.

Furthermore, in each case a first horizontal housing guide track 22, which defines the displacement stretch that is fixed with regard to the housing is formed on the housing side-parts 21. A guide pin 41, which is fixedly connected to the second brewing module part 4, engages through the housing guide track 22 in each case into a guide opening 33 of the cam discs 30.

For this purpose, the guide pin here on both sides includes a first plane bearing 42 and a second plain bearing 43, which is decoupled from this with regard to rotation. The first plane bearing 42 is engaged with the housing guide track 22, whereas the second plane bearing 43 projects into the corresponding guide opening 33.

On account of the guide surfaces, which are formed by the guide opening, a pivoting movement of the cam discs 30 on actuating the operating lever 6 is converted into a displacement movement of the second brewing module part 4 along the displacement stretch, which is defined by the housing guide tracks 22.

As FIG. 4 particularly shows, the guide opening 33 on account of its shape forms a first guide surface 34 and a second guide surface 35, which is not parallel to this, the guide surfaces effecting a displacement of the brewing module part given the closure movement and/or given the opening movement. The non-constant transmission ratio is effected by way of the guide surfaces describing a path that, different from an Archimedes spiral, runs with the bore 32 as the middle point.

In the represented embodiment example, the first guide surface 34 includes a first section 34.1 with a comparatively large transmission ratio. In a second section 34.2, a significantly smaller transmission ratio is defined, so that the user does not require too much force, for example on piercing the capsule and/or on moving the capsule collar from one track into the other track. In a third section 34.3, the transmission ratio is mediums-sized. In the corresponding third region of the displacement stretch, for example the piercing tips are inserted completely into the capsule and the capsule is possibly slightly compressed between the brewing module parts, which is why a medium-sized force effort is required. The transition from a small to a medium-sized transmission ratio between the second and the third section (the resistance per displacement stretch, able to be felt by the user, increases again) prevents a sudden yielding after the effected jumping of the capsule collar from one track into the other track, as is described in WO 2015/048914; such a sudden yielding is perceived by the user as a jolting and on account of jolt-like loads can also have a negative effect on the service life of the brewing module.

For illustration: In an embodiment, the transmission ratio in the first section is between 0.6 mm/° and 2.5 mm/° (the transmission ratio does not need to be constant within the respective section, but can indeed vary), in the second section between 0.1 mm/° and 0.2 mm/° and in the third section between 0.2 mm/° and 0.4 mm/°. For example, by way of the first section the second brewing module is pushed to the front by approx. 25 mm within an approx. 30° lever movement, in the second section by 2-3 mm within a 15° lever movement and in the third section by 10-12 mm within a 40° a lever movement. Of course, very different numbers are also possible, and the optimum depends on the specific geometry, the selected materials and possibly also the damping device. In any case, the difference between the different transmission ratios along the path is substantial.

The second guide surface 35 for the reverse path likewise includes three sections. A first section 35.1 with a medium-sized transmission ratio serves for the initial opening of the brewing chamber and the first step in the process of removing the capsule. In a second section 35.2, the transmission ratio is small since, for example, a large force is necessary in order to withdraw the capsule further amid deformation, so that it can subsequently drop downwards. In a third section 35.3, the transmission ratio is large, so that not too large a path of the operating element is necessary for opening the brewing chamber to a sufficient extent given a small mechanical resistance.

The transmission ratios and the paths, which are covered and effected by the second guide surface, can roughly correspond to the values of the first guide surface, wherein the third section of the first guide surface corresponds to the first section of the second guide surface, the second sections correspond to one another and the first section of the first guide surface corresponds to the third section of the second guide surface.

An example of a brewing chamber is described in WO 2015/048914, in which the capsule, on closing the brewing chamber and on renewed opening of the brewing chamber, is subjected to different mechanical loads in different phases, which is why differently large closing and opening forces are to be exerted. The present invention however is not limited to brewing chambers of the type which is described in WO 2015/048914, concerning which the force which is to be exerted on closing and/or opening is not constant over the whole path.

A special optional feature is likewise represented in FIG. 4. The guide opening 33 of the cam disc 33 towards its inner end forms an end section, in which the first guide surface 34 merges via a shoulder 37 into a slightly undercut portion. This effects a jamming of the arrangement, i.e. when on brewing an outwardly directed force acts on the second brewing chamber part due to the inner pressure, which is produced in the brewing chamber, this effects a force introduction 38 by the guide pin into the cam disc, the force on account of the undercut counteracting an opening movement—the guide pin is therefore pressed into the undercut end-section, as is represented by the block arrow, which symbolises the force introduction 38. In this context therefore the design is self-locking.

FIG. 5 in a sectioned manner shows the brewing module given the closure movement, wherein the guide pin is displaced to the right in FIG. 5 in the first housing guide track 22 by way of the abutting on the first guide surface when the cam disc 30 is pivoted in the clockwise direction. The transmission ratio in the represented embodiment is determined on the one hand by the angle between the tangent T to the guide surface 33 at the location of the contact with the guide pin 41 and on the other hand by the movement direction, which is defined by the housing guide track 22—in the represented example the horizontal. The shallower this angle, the larger is the transmission ratio. A more complicated relation between the transmission ratio and the course of the guide surface results when the movement direction, different than the embodiment example that is discussed here, does not run radially to the rotation axis (which is defined by the bore 32).

FIG. 6 shows the corresponding representation with the opening movement by way of a pivoting of the cam disc in the anti-clockwise direction.

A damping device is also illustrated in FIGS. 5 and 6, the damping device being formed by a damping element 52 and a sliding surface that interacts with this. In the present example, the damping element is herein present on the cam disc and the sliding surface arranged in a manner fixed with respect to the housing, for example is formed by the housing or is formed on an element that is arranged in a fixed manner with respect to the housing. However, it could also be the other way around; generally the damping device according to the principle described herein requires two parts that are moved relative to one another during the opening and the closing procedure and between which friction can result on a part of the closure path and/or possible also of the opening path.

FIGS. 7-9 show a detail of the brewing module with a damping element 52 and with a sliding surface 51 in different stages.

The damping element includes an elastic element—here a damping ring 53 that extends around a guide portion 58. The damping ring is arranged in a receiver 54 that is provided for this, and is partly movable in this.

FIG. 7 shows the situation during the closure procedure, concerning which the cam disc 30 is moved in the direction of the movement direction 60 to the housing (cf. FIG. 5), and specifically shortly before the end phase of the closure procedure, for example when particularly high forces act upon the second brewing chamber part. The damping ring is located loosely in the receiver 54, without physical contact with a part that is fixed with respect to the housing: there is no damping.

The situation that occurs shortly afterwards, thus towards the end of the closure procedure, is represented in FIG. 8. The damping ring 53 abuts on the sliding surface 51 and on account of the forwards movement (movement direction 60) of the cam disc is pressed into a narrowing 55, which results between the receiver and the sliding surface 51 and which is dimensioned such that the damping ring only has space therein under definition. For this reason, the damping ring presses against the sliding surface 51 on account of its elasticity and a friction resistance, which counteracts a forward movement results. In the shown embodiment example, this friction resistance gradually reduces during the further forwards movement since the sliding surface 51 does not run completely parallel to the movement direction but in a slightly chamfered manner, thus is designed in a receding manner.

During the opening movement (FIG. 9, movement direction 60), the onset of friction between the sliding surface 51 and the damping ring 53 does not press this into the narrowing 55 but permits a yielding out of this into a region, in which the damping ring 53 has space without deformation. For this reason, there is only a minimal friction between the damping ring 53 and the sliding surface 51, i.e. the opening movement is not prevented.

If the damping ring 53 is located outside the narrowing 55 during the approach to the sliding surface 51 during the closing movement, an optional oblique surface 56 together with the intrinsic elasticity of the damping ring and its coming into contact with the sliding surface 51 ensures that the damping ring is pressed into this during the phase, which is represented in FIG. 8.

Instead of a damping ring, another, for example, elastic damping element, for example, an elastic lip, can also be used. The damping element is preferably arranged and designed such that when it comes into contact with the sliding surface, it is deformed in the one direction by way of a movement relative to the sliding surface and exerts an elastic force upon the sliding surface, the force counteracting the deformation, whereas it can yield given a movement in the other direction and can slide along the sliding surface in an essentially force-free manner. Given an elastic lip, this is achieved by way of the lip not being perpendicular to the sliding surface, but at a non-right-angle thereto.

A machine according to the invention, for preparing a brewed drink from a portion capsule 10, here specifically a coffee machine, with a brewing module 1, is schematically represented in FIG. 10. Apart from the brewing module, it includes a water tank 91, a pump 92 for feeding brewing water to the injector 4 and a water heating device 93 (for example, a continuous heater). Furthermore, a capsule container 95, into which the capsules 1 drop or are transported after the brewing process is arranged below the brewing module. The reference numeral 98 indicates a coffee cup.

LIST OF REFERENCE NUMERALS

1 brewing module

2 brewing module housing

3 discharge device

4 injector

6 operating lever

13 drinks run-out

21 housing side-part

22 first housing guide track

25 second housing guide track

30 cam disc

31 pivot

32 bores for the pivot

33 guide opening

34 first guide surface

34.1 first section

34.2 second section

34.3 third section

35 second guide surface

35.1 first section

35.2 second section

35.3 third section

36 end-section

37 shoulder

38 force introduction on brewing

41 guide pin

42 first plane bearing

43 second plane bearing

45 first stabilisation pin

46 second stabilisation

51 sliding surface

52 damping element

53 damping ring

54 receiver

55 narrowing

56 oblique surface

58 guide portion

60 movement direction

91 water tank

92 pump

93 water heating device

95 capsule container

98 coffee cup 

1. A brewing module for preparing a brewed drink from a portion capsule, comprising: housing; a first brewing module part and a second brewing module part, which is movable relative to the housing between a first brewing module part position and a second brewing module part position, wherein a brewing chamber is formed in the second brewing module part position, said brewing chamber at least partly surrounding the portion capsule being located in the brewing position with the brewing procedure, wherein the brewing module is configured to brew a brewed drink by way of introducing a brewing fluid into the portion capsule and to discharge this out of the portion capsule; and an operating element, which can be brought manually from a first into a second operating element position, a transmission mechanism for transmitting a movement of the operating element into a movement of the second brewing module part relative to the housing, further comprising a damping device for damping the movement of the second brewing module part, said damping device being designed such that it has non-constant damping characteristics as a function of the position and/or as a function of the movement direction.
 2. The brewing module according to claim 1, wherein the operating element is an operating lever which can be brought from the first into the second operating element position by way of a tilting movement from top to bottom, and wherein the operating element in the second operating element position closes a capsule insert opening.
 3. The brewing module according to claim 1, wherein the second brewing module part is movable relative to the housing in a linear-translatory manner and the first brewing module part is assembled in a manner fixed with respect to the housing.
 4. The brewing module according to claim 1, wherein the damping effected by the damping device is effected by way of friction.
 5. The brewing module according to claim 1, wherein the damping device is designed such that it only damps along a part-stretch of the displacement stretch and/or that it only damps during the closure movement or only during the opening movement.
 6. The brewing module according to claim 5, wherein two parts which are moved relative to one another given a movement of the operating element each have a contact portion which only come onto physical contact with one another and rub on one another on a part-stretch of the displacement stretch.
 7. The brewing module according to claim 1, wherein the housing comprises a sliding surface, and an element that is moved given a movement of the second brewing module comprises a damping element which on account of an elastic force and/or on account of a jamming on the part-stretch is pressed against the sliding surface, or vice versa.
 8. The brewing module according to claim 7, wherein the damping element comprises elastomeric properties.
 9. The brewing module according to claim 7, wherein the damping element is arranged and designed such that when it comes into contact with the sliding surface, it is deformed in the one direction by a movement relative to the sliding surface and exerts an elastic force upon the sliding surface, whereas it can yield given a movement in the other direction and can slide along the sliding surface in an essentially force-free manner.
 10. The brewing module according to claim 9, wherein the damping element is movably arranged in a receiver which to one side forms a narrowing, into which the damping element is pressed on movement relative to the sliding surface in the one direction.
 11. The brewing module according to claim 7, wherein the sliding surface has a distance to the damping element, said distance varying as a function of a relative position, so that the friction force changes as a function of the position.
 12. The brewing module according to claim 1, wherein the transmission mechanism comprises a cam disc, which is rotatably mounted on the housing by the operating element, and which comprises a first guide surface, wherein the second brewing module part, by way of the first guide surface, is displaceable along a displacement stretch being fixed with respect to the housing, from a first brewing module part position into the second brewing module part position by way of the cam disc being rotated and that the first guide surface defines a transmission ratio variable along the first guide surface.
 13. The brewing module according to claim 12, wherein the housing comprises a sliding surface and wherein the cam disc comprises a damping element which on account of an elastic force and/or on account of a jamming on the part-stretch is pressed against the sliding surface or vice versa.
 14. The brewing module according to claim 12, wherein the cam disc furthermore defines a second guide surface, by way of which the second brewing module part is displaceable along the displacement stretch being fixed with respect to the housing, from the second brewing module part position into the first brewing module part position.
 15. A drinks preparation machine comprising a water feed, a pump and a water heater as well as a brewing module according to claim
 1. 